Paper-bag machine.



PATENTED MAR.12, 1997.

F. E. STRASBURG.

PAPER BAG MACHINE. APPLICATION FILED 0012s, 1906.

10 SHEETS-SHEET 1.

eyer/m5 J/mJZWy PATENTED MAR.12,= 1907.

' F. E. STRASBURG. PAPER B'AG MACHINE. An LmATmN FILED 0012a, 1906.

10 SHEETS-SHEET 3- No. 847,264. PATENTED MAR. 12, 1907. F. E. STRASBURG. PAPERBAG MACHINE.

APPLICATION FILED 0618,1906.

10 SHEETS-SHEET 4.

PATENTED MAR. 12, 1907.

F. E. STRASBURG. PAPER BAG MACHINE.

APPLICATION FILED 001'. a. 1906.

10 SEEETS-SHEET 5.

' No. 847,264. I PATENTED MAR. 12, 1907.

. F. E. STRASBURG.

PAPER BAG MACHINE,

APPLIGATION FILED OCT.8, 1906.

10 SHEETS-SHEETB.

P'ATENTED MAR. 12, 1907.

I. E. STRASBURG.

PAPER BAG MACHINE.

APIPLIOATIQN FILED 0010,1906.

1o SHEETSSHBET 7.

PATENTED MAR. 12, 1907.

F. E. STRASBURG.

PAPER BAG. mamm- APPLICATION 311.21) 0012s, 1906 v 1o sums-sum a.

CQ/LWZX/mL 9 W [120622 of, FEdQP/CZZ $2517.55 0273,

PATENTTED MAR. 12, 1907.

P; 13.. STR ASBURG. PAPER BAG MACHINE. Arrm'ouro'u FILED 0018,1996.

l0 SHEETS-SHEET 9.

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%w. WZfl 2' 42M UNITED STATES PATENT OFFICE...

FREDERICK STRASBURG, OF RUMFORD FALLS, MAINE, ASSIGNOR- '1'O CONTINENTAL 7 PAPER BAG COMPAN CORPORATION OF MAINE.

Y, 0E UMFORD FALLS, MAINE, A

PAPER-BAG MACHINE-- Specification of Letters Patent.

Patented March 12, 1967.

Appliozitioli filed October 8, 1906. Serial No, 337,971.

.To all whom it may concern.-

Be it known thatI, FREDERICK E. STRAS- 1 BURG, a citizen of the United States, residing at Rumford Falls, in the county of Oxford and State of'Maine, have invented certain new and useful Impr vementsin Paper-Bag Machines, of which the following description and claims-constitute the specification and which are illustrated by the I accompanyingv drawings;

. This machine automatically opens out a tucked-paper tube into a diamond form; and

thus participates in manufacturing continuous tucked-paper tubing into square-bottom paper bags like those of Reissue Letters Patent No, 10,083, granted April .11, 1882;i1'pon V the application of Mark L. Deering, and in so patent; but those drawings exhibit rotary doing does an important partof the work' which has long been done by the machine of theClau'ssen patent, No. 598,497, of February The drawings which accompany this specification exhibit my invention as ap lied to such rotary folding mechanism be ow the paperas that shown in the Olaussendifferential mechanisms connected "with the rotary foldingmechanism above the paper,

each of which four forms of differential mechanism differs materially in construction and, rnode of operation from everything I shown in the'Qlaussen patent, and likewise differs, as I believe, from everything shown anywhere in'the prior artof paper-bag Ina-j ,chme r r Though the descriptive part of-thrs specification I primarily attends to 4 the particular mechanism shown in the accompanying drawings,'my invention, as defined'in sundry. of mv'claims, may include combinations in i i which the, folding mechanism below the paper differs materially from the particular ro- "-tary folding mechanism below the paper,

which is shownin the Claussen patent and is also shown in the drawings whichaccompany this specification.- i I When Ispeak of folding mechan sm below one ply of a tucked-pa 'therfolding mechanism above th the paper and of folding mechanlsm f above i v the paper, I do .not mean that the paperis 5 5 always horizontal and that the folding mechanism below the aper is directly between it and. the earth, while-the folding mechanism above the paper is directly between it and the sky, for the paper maypass through the 60 machine diagonally or vertically instead of horizontally; When I speak of the folding mechanism below the-paper, I mean to include. the fo'iding beds, upon one of which or tube is gripped and 6 5 held, and by the fol ingmechanism above the. paper" I mean that mechanism-which grips the other-ply of the -tucked -paper tube and turns andfolds it back upon itself.

7' In. the drawings which; accompany this 7e specification, Fi ure 1 is a side elevation of a part of a paperag machine, whichp'art includes the rotary folding mechanism below the paperof the Olaussen' patent andincludes-my new rotary folding mechanism 7.5

above the 'pa er. Fig. 2 is a plan view of-the' machinery- 0 Fig.1 looking in'downward diagonal direction -of't he arrow A of Fi 1. Figs. 3- to 8, inclusive, are a series of sectional side elevations taken on line bf) of Fig.2 and X86 looking in the-direction of the arrow B. in

that figure and showing successive positions of the folding mechanism below the paper, and of-the folding mechanism above 1 the paperin my machine without showing the-85- -means by which those folding mechanisms are respectively rotated. Figs. 9 .to' 14,'in-" elusive, are diagrammatic side elevations showing successive'positions of one form. of

mechanism for imparting varying rotation to 9d epaper.

The positions shown in Figs. 9 to 14, inclusive, of that operating mechanism correspond withthe positions-shown in Figs. 3 to 8, iiiclusive, of the rotary folding mechanism op- '95' erated upon thereby. Figs. 15, 16, and 17 are'side elevations, otherwise similar to Fig. 1, which show three other-mechanisms for-v imparting the desired variable rotation to the folding mechanism above the paper; roo- Figs. 18,19, and-20 are partial front elevations of the mechanisms of Figs. 15,. 16, and

I 17 looking in the direction of the arrow'Ain those figures respectively. The three meche anisms shown in Figs. 15, T16, and 17, respec- 10 ,ti-vely, are included in this specification and the accompanying. drawings as showing three separate equivalents ofthe mechanism impartingthe necessary variable rotation to the folding mechanism above the paper. Fig.

'21 is a'diagrammatic side elevation illustrating' the relative positions of gears 80 and 83 during'one complete rotation of each of them.

In the accompanying drawingsthe riumer als 2 and,.3 indicate the two sides of the frame, upon which are mounted the various;

. Harts of m'ovingl machinery shown in the rawings. Insleeves45, 1nreachingfrom side frames-2 3, respectively-is journaled the con- -veyer-shaft 8. Sleeves 4 5 are provided with flangedheads 6 7,respectively,througl1 which, by-me'ans of bolts 9, said, sleeves may be secured to their respective side frames.

' inwardly reaching from pivohshaft 12, and to I p which shaft said arm and front clip 19 are fixed. Said. armhas pivotally mounted on the inner end thereof cam-roll 21 for enis shown. 12 in conveyer 10, and said conveyer is pro:

Fixed. to shaftS, about midway'bet'We'en frames 2 3, is the rotary conveyer 10..

Pivotally supported by the rotary conveyer are one or. more carriers or folding-f beds,'.as 11. In the present drawings places are provided in conveyer 10 for three such folding-beds, but for convenience only one Said folding-bed 11 is pivoted at vided with pivots "13 14for. the other two folding beds. Folding bed 11 ,inay be caused to oscillate on pivot 12 toward .and away from axis 8 during its rotation about said axis on conveyer 10 by the fixed cam 15,

which is mounted on "the sleeve 4 -and has a; cam-groove 16 for engagement with roll 17, carried byzinwardly-reaching proiection 18.

of folding-bed 11. Said folding-bed 11 is provided with the front clip 19, pivoted co axially therewith at l 2'. Said front clip may be actuated in proper time by means of arm 20,

agement with the periphery of cam Said cam 22 is fixed to the inward end'of sleeve 5. Cam-roll 21 may be urged to coaction with said cam and front clip 19 to itswork of gripping the forward end of the lower ply of the bag-blank to the folding-bed by the impinging of spring-actuatedv plunger 23 in conveyer 10 against heel 24 of front clip, Folding-bed 11 isalso provided with the side clips 25 26, pivoted in suitable brackets thereon.

8. Gear 33 has a diameter three times greater than that of gear 31, wherebyshaft is caused to 'make three revolutions. for

3 each revolution ofshaft 8. Power may be shown in Figs. 9,10, 11,12, 13, and 14 for Said side clips have the cam-rolls, as 27, for engagement with cams Said gear 31, through intermedir communicated to the machine by means of pulley 34 on main shaft 36.

l The .machine'is also provided with the blank-feeding rolls 3637 and 38 39. .Rolls- 36.37. aregeared trjgeth'erv to rotate at equal surface speeds by means of gears 40 41, re-

spectively, aflixed tov the respective rollshaf-ts 42 43. Said rolls each have acircu-mferenee equal to a bag-blank length and are driven toxmak'e three. revolutions for each I revolution 'ofconveyer 10 by the following am 'o-f gearing: Gear 44 on stud 95 meshes-1;

with conveyer-gear 33, and turning on the same stud and fast to gear 44 is'gear 440, meshing with gear 410 on shaft-43 of roll 37. Roll-shaft '42 may be mounted in. slidable boxes 402' 420. and "said boxesurged downwardly to hold roll 36 to its work by springs, as 97. Roll 36 may be provided with a creaser-blade 35 for coaciion with a cre'asergroove 45 in roll 37for forming a' crease in v the bag-blank on the llne of the main trans verse fold, Feed-'rolls-38 39 are geared together by gears 46 47, fix'ed to rell-sl1afts-48- 49,respectively.v Ltwer gear 47 is driven from conveyengear 33 through intermediate gear 480,,wh'ereby said rolls are caused to.

revolve at a surface speed equal to the surface speed of the folding-beds.

The machine is "also provided with the creasing and pasting wheel 490 for forming the creases on which to fold over tltle front and rear flaps of the diamond to finish the bag-bottom andfc-r applying paste to secure these flaps in lace. This cr'easin and pasting wheel is 'ixed to shaft 50,-and to said shaft is also fixed gear 51 for engagementwith conveyer-gear 33, whereby wheel 490 is driven at the same surface speed as the fold v ing-beds.

Onshaft 52, supported for-involution in brackets 54 55, upstardingfrom side frames 2 3,-respectively, is carried means 'c'ooperat ing out the forward end-ofthe bagblanks and foldin them down into the well-known and somewhat ofiset from its axis of revolution Fixed to said middle rectangularportion 53 are blades 5657 for engagement withside clips 58.59, respectively, to grip the upperplies of the side tucks of the bag blank to turn over these upper'plies in forming. the diamond, fold. Said blades 56', 57 have. their ends bent backwardly at 560 570,'res ectively, to allow free access of the upper p y of the bag-blank thereunder and over front hook 71. Side clips 53 59 are pivotally sup orted on shafts 60' 61, mounted for oscil at'ion in o 'and'adjacent to the path of t e bag-blank on the folding bed. Said shafts'60 61 preferably lie in one plane and each at an angle of. about forty-Eve degrees with shaft .52.

- ing with the successive-folding beds for open.- 1

posite sides Shaft 60 is provided at that end thereof opposite Sidelcli' 58 with a' cam-rollam 64, bear- .ing.cam'-ro 65 3 for engagement-with-cam' 66.

"with cam 76,al11si Bearing 54 isprovided-withan inwardlyreaching sleev'e 6.8,jitowhichsaid cam 66 is,

fixed. ROH-aI'iiI fi'ha'sla portion 67' proactuate plungei'l ;170and'by which means side clip' 58. is urged to its workand roll 65 to engagement with cam 66; For convenience of adjustment cam 66may com prise two. members 606 660, each. provided with clamping means for'securing saidmem-" bers to sleeve68; 'Side clip 59. is {mounted similarly toside clip" 58' and isactuated,- by

cam-arm- 74,13 roll. 7.5 in engagement 58, excep't't'hat the operating means forg sid'e 'gagemen't withthe upper-ply of'theforwardg .on are caused'torotate in coaction-with the 1 successive folding b'eds' by means of differ-i ential mechanism,- which 1 will now; describe. I On shaft 52 and for convenience attheright hand end thereof, Fig.2; 'is-,fixecl 'gear 80: Sa'id gear is driven through two floating gears" ,(81 82 by. gear 83.. In the present instance" saidgear 83 is mounted on fixed stud-.72, supv ported in bracket 73',bolte d by-two; of bolts 9to flange 6 of sleevei For convenience gear 83 meshes witlfand is driven by gear 84'" on creaser-shaft 50! As shaft 50 makes three rotations for. each revolution of con' end ofthe -bag-blank'.

Shaft 52 and" the mechanism carried there veyer 10 and as ears 80and 84 are equal ears, shaft 52 wil also make three rotatlo'ns for each revolution of'conveyer 10 and one rotation for eachpassing folding-bedon that conveyer. Shaft 52 could bev driven; from any of several sources of power other than a shaft and whichdriving would in all'ways serve the present purpose, provided that the gears were proportionedto cause shaft 52 to.

- make one complete rotation for each passing of a' folding-bed, and provided said transmission was made through "means which are shiftable and thereby adapted to vary-the speed of the shaft 5'2.

.flPivoted on shaft 52 011 0 posite'sides ofgear are arms 77 78, in t e free endsof which issupported gear 81 for revolutionin mesh with gear-80. Pivoted on stud 72'on each side vof ear 83 are arms 87 88, in the free ends of whic is supported gear 82- for revolution in mesh with gear 83. For retaining gears 81 82 in mesh studs 86 thereof, re-

f-spectively,are linked together by arms 89 90.

Gear 82 may be madeto oseiilate a boutjstudv 72 andin mesh with gear 83 and gear 81 to oscillate about shaft 52 in mesh gear 80 p r-to' thecorrespondmg partsjjust described for actuating side. clip '29 v equ'al efii'ciency. with the arrangement illus- 59f 'are 'of-the opposite hand-to those for.-

clip 58. Attached to the middle por tion from the. uniform rotation in a clockwise.

on one side and gear 82 on the other side to accelerate or retard the rotation of gear 80 and'shaft 52 by means of cam-arm 7 9, one end of which'is pivoted to stud 86 of gear 82 and the other end of which bifurcated at-9 1 .ito' slide back and forth onshaft 30. For convenience said bifurcated end 91 .is arranged .ient' position injsome. other part of the ma"' chine and. by a slight modification of the campath 95 .of said cam arm7 9 may be connected to: stud'85 to oscillatethe floatingge'ars'with.

trated in the present drawings. By means offloating gears 81 82; arm; 79, and cam 96 gear 80 and shaft 52 may be driven at-a-ya riable rotary speed in an anticlockwise direcdirection of gear 83 to cause shaft 52 and the- Inechanism'carried thereon to harmoniously doact with any given folding-bed on canveyer {10 to open out the forward end of the bagblank and fold it down into the diamond fold I and then to cause said shaft 52 and the mech-' anism carried thereon to continue their rotation in an anticlockwisedirection backto their initial positions ready to coact with the n'ext'succeeding folding-bed on conveyer 10, and so on continuously.

-.T he' successive steps in the variable rotation of gear 80 relative to the successive ste s in the uniform rotation of gear 83 may be ollowed in the diagrammatic view 0f Fig;- 21. Therein positions a c of said gears, re-- s ectively, correspond. with the position of b ades 5657 when the bag-blank is being delivered under said blades preparatory to the formation of the diamold fold, Fig. .3. From-position c to position e gear 80 rotates atan increasing speed, while ear 83 revolves at a uniform speed from position 0 to position e thereof. Positions e e of said gears in I 21 correspond approximately with the positions of those gears in Fig. 5. From posltion topositionggear 80 rotates ata decreasing speed. (SeeFig."7.) Gear 80 nowincreases its speed frompositiong to osi'tion j, (approximately the position of ig. 8.) From position 7' gear 80 rotates at a decreasing speed through positions It i, &c., to its origi 'nal position a;

Referring now to Figs. 15 and 18, have therein illustrated equivalent difl'erential mechanism for rotating at the desired variable 5 eed shaft 52 and the mechanism there- 11 said Figs. 15 and 18 gear 800, mounted to turn freely on shaft 52,is driven inan anticlockwise direction at a uniform speed to in bracket 106. Said bracket is attached, by

means of screws 104, to gear 800 for revolution therewith at a uniform speed. Said arm 1 has formed thereon segment-gear 1 11 for engagement with segment-gear 112 on shaft 52. The other member of said arm 110 carries roll 113 for engagement with groove 950v of cam 960. Said cam 960 is fixed on sleeve 540, projecting'outwardly from box 54 of shaft 52 by means of set-screw 906. If now as gear 800 revolves ata uniform speed on shaft 52 arm 110, carried on said gear to be held against rotation on pivot 105, its segment-gear 111, in mesh with segment-gear 112, fast on shaft 52, will hold said segmentgear 112 and shaft 52 against rotation relative to gear 800 and will cause shaft 52 torotate in unison with gear;800; but as arm 110 hasits .roll 113 in engagement with groove 950 of fixed cam 960 said arm as it is I carried around by gear 800 will be oscillated back and forth on its pivot 105, and itsseg ment-gearlll, in mesh with segment-gear 112, Will cause said segmentrgear and shaft 52 to oscillate about the axis of saidshaft relative to gear 800. As roll 113 is moved toward shaft 52, said shaft Will be caused to rotate faster than gean800, and as said roll is moved away from shaft 52 said shaft will be caused to rotate slower than gear 800.

Thereby variable rotary motion is imparted toshaft 52 and the mechanismcarried there.-

on from the uniform, rotary motion of gear 800. Also the contour of cam-groove 950 is such that the folding mechanism on shaft 52 is caused to rotate at a speed so varied within each revolution as to suitably time said folding mechanism with each successive folding;

bed on the rotary ca'rrier10 in the formation of the diamond fold of a bag-blank.

In ITigs. 16and 19 I have illustrated an' other equivalent differential mechanism for rotating at the desired variable speed shaft 52 and the mechanism thereon. Therein gear 801, mounted to turn freely on shaft 52,

is driven in a clockwise direction at a uniform speed to make one revolution for each passing of a folding=bed on conveyer 10. For convenience gear 801 is shown as driven'from gear 804011 creasershaft' 50, said gears being of equal diameter, through intermediate gears 802 803. Said intermediate gears turn freel on studs 702 806, respectively projecting ing from frame 2. For clearnessof illustration the mechanism on shaft 52 in Fig. 19 is shownpartly in section. I To the hub. of the gear 801, turning freely on shaft 52, is fixed bevel-gear 120, meshing with bevel-gear 121,

ivoted to turn freely on rock-arm 119, turneely cf) shaft 52. Bevel-gear 121 me es onthat side opposite bevelear 120, with bevelgear 122 fixed on s aft 52. Bevel-gears 120 and 122 are of equal diame ter and coaxial. By this train of three bevelgears'rotary'movement may be transmitted. to shaft 52 from gear 801, but in the opposite direction v to the movement of that gear. Fixed on. shaft 50 by set-screw 118 is cam 906,- having cam-groove 905 for engagement with roll 123 of arm 790. Said arm 790 is pivoted at its lower end to rock-arm 119 and at is upper end is bifurcated for sliding engagement with shaft 50. Said arm is maintained in operative position on shaft 50 by collar 125. antiblockwise direction and rock-arm 119 and bevel-gear 121thereon be held against turning about shaft 52, said shaft will be, caused to' rotate at'the same speed 'as gear 801, but in the opposite direction; b ht as arm 790 has its roll 123 inv engagement with groove 905 of cam 906 arm 790 .vn'll rock arm 119 and transmitting bevelear 121 thereon to cause bevel-gear 122 and s aft 52to rotate.

moved toward shaft 50 and slower when arm 7 is moved away from said shaft. Thereby variable'rotary motion is imparted. to shaft 52 and the mechanism carried there-f 801. Also the contour of cam-groove 905 is such that the folding mechanism on shaft 52 is caused to rotate at afspeed so varied.

If new shaft 50 be rotated in an faster than bevel gear -when arm..790 is I on from the uniform rotary motion of gear within each revolution as to suitably time said folding mechanism with each folding-bed on the conveyer 10 in the formation oftheg diamond fold of a bag-blank.

In Figs. 17 and 20 I have another equivalent differential mechanism for rotatingatthe desired variable speed shaft 52 and the mechanism thereon. Therein internal gear is secured by set-screw 134 to an outwardly-extending portion of shaft illustrated I 8. For clearness of illustration the mechanism on said shaft is shown partly in. section in Fig. 20. Internal gear 130 actuates: gear 137 through planetary idle gear 136, which is in mesh with both gears 130 and 137. Said gear 137 is mounted to turn freely on shaft 8,

coaxial with internal gear 130. As shaft 8 is actuated atone-third the rotation speed desired inshaft 52, internal gear 130 is'of three times the diameter of gear 137. On the outer end of sleeve 138 of gear 137 is fixed gear 809 for revolution therewith. Planetary transmitting-gear 136 is mounted for free rotation on stud 141 of rock-arm 140.

The hub of said rock-arm encircles sleeve 138 of gear-iij'i thereon; Ann

140 and .transmi-tt'irig-geari 1 36 thereon may be shifted ina circular path about the-axis of- Y shaft 8- means ofarm 79'l,"bearing roll 133 in engagement with groove iof cam 966.

.Saidcam 966is mounte'd on shaft O'a nd issecured-,Jthereto lby" set screw 129. Said shaft 50.is.geared to revolve-at a constant 791 is coimeotedtorock=arin1t0 by means at its upper. endfor sliding'engagement with shaft and is maintained in operative lposi- .tion'on shaft 50 bycollar 135. Motion is transmitted from gear 809 to equal gear- 807 [fast on'shaft 52, through idle gear 808,"turn-f ing freely on'stud' 143' in hub 142' of frame-2:

If now shafts be rotated in a clockwise direction and rook-arm 140, carrying'plang'at ary,

idle. gear 136, be restrained, against tm'nmg about shaft 8% an axis, internal gear,130-,

. ananticlockwise direction at aconstant v speed relative to. internal gear 130;=,but in the I ratio ofthree to oneto said. internal'gear'.

Then through gear 809 on sleeve .138iof 'gear 137, idle'gear' 808, and gear 801 .onshaft. 5'2- said, shaft. will also ;be driven at a constant speedof-rotation equal to that of ge'ar. 1 37 but .as arm 'Z91 -has its roll 133 engagement with groove .955' off cam-"966 arm 7 91 will? ,':rock jarm'f'140 and idle gear 136 thereonto cause-gear'137 to rotate relativelyfaster than v internal gear 130 when arm 791 removed to:-

wardflshaft 50 and relatively slower when arm/Z91 is moved away from saidfshaft. Thereby through thetrain of gears 809, 808, and 807. variable rotarymotion is imparted to 52 from I the uniform rotary motion of "mt'ernal gear; 130. :"Also the c'ontour of camoove 955' is such that the folding mechansmon shaft52'is caused torotate at a speed so Varied Within eachrevolution as to suit- .anism a ablv time saidfolding mechanism nith each folding-bedontheconveyor 10 in the formation of the diamond fold. of. 81' bag-blank. The'in'ternal gear mech nism df Figs. 18 "and '20- is mounted on sh' {t8 for toox enience only ant-loan as-well' be mounted on shaft 52.;or elsewhere, provided "that the" ratios of the gears be-sqc'h as to producethe-de'sired number of revolutimts of shaft 52. There are also still other equivalent means for so combining the folding m'echanisinbe-T .5 5

low the paper with the rotary'folding mechs ove the paper as to enable: those 1 mechanisms to harmoniouslyoooperate t.o--

* blank. The four forms of combining mech make the diamond fold in -a paper-bag:-

this specification are selected as typicalof all equivalent means for'acoomplishing that result. p

:T" will now. describe the operation. of my present machine when it includes the :phrticular operating mechanism shown in 'Figs. 9 to 14 of the drawings. i

" 'A section of tucked aper tubing of suitable lengthfor agbag-blank'is presented to the biteoflrol'ls 36 37, Figs. 1 and '1, creasers 7Q 35 45 beingatsuohdistance from said bite as toYform-later the crease for the main traverse fold-of the bag-bottom at the proper dis- Lance from the leading end of said bagblank.

The machine is thenstarted and the bag: blank is ,fed forwardly and l up'wardlyv be tween said rolls" 36 37. A: crease, 99 is formed. across said blank by creasers 35 a5 and -theforward end-f'of the bag-blank deliveredintotheibitegoi ran es 39..v Rolls 38 39: so tevolveat-"a surfade-speed' equal to the surface; speed oft-he folding-bed and somewhat fasterthan the surface speed offrolls 36 37 thereby oausingthe' bag-blank to be drawn .o'nt f rbm rolls 363.7 or roll 36 may be lifted 5 will drivefgear l37 through idle gear 136 in n to release the-blanh at-the proper time by some suitable'm'ea'nsl .(Notshown.) The bag-blank is then delivered onto the contiguousfolding-bed, as 1'1, and with the forwardendflofthe-lower ply of said blankun- 9 derffront .olip 19. Ther'eupon front clip 19 r i ip,szsaid forward end of the lower ly of the blank 1 tirthe' forward. end of: -'the to ding-bed and-s'ide-iclips 2526 thelower plies of the.

respecti'ye sidetu'ekstothe sides respectively of. the folding-bed, Fig; "3'. At this time shaft 52' its-anticlockwise rotation has reached the position of Fig.3} andthe upper ply of the mouth of the:ba;g-.b 1ank asses under blades ing gears 81 82 and their actuating mechan ism are. in the positions of Fig.9. The fold.- ing-bed now advancing; in a clockwise direction from the position. o'f lFig, 3 to that of I Fig. 4 carries the upper ply of the-.bag- I 5 blank well up onto fro'n't finger 71, and the continued rotation of shaft 52' carries; side clip-rolls 65 75 onto the [high parts of their respective jiixed. cams. 66 76-, whereby side Clips 58 59 grip the/upper plies. of the respeci 2 v tive side tucks. tofingers 56 5 7' respectiyely;

' Floating "gears 8} 82;" a'nd-their actuating 1mechamsmiarenow-in the positions of Fig.

10'. 1101194 ii -groove 95. of cam QflDOW S passesfrom the high part-of said-groove to the position of. Fig. 11, whereby arm 79 is retracted toward shaft 30 and gear 82 is caused to roll in an. anticloekwise direction on gear 83 against the direction of rotation thereof,;there by increasing the speed of rotaation of gear 82, andgear 81 i scausedto ror-tate inya clockwisedirectiononygear 82 against the direction of rotation thereof,

Q t-hereby increasing the speed of rotation of 5 'gear'81 over .that of gear 82;- but .gearSl is r'alfs'ocaused to roll in an anticlockwise direetion on gear, 80. in.:the same directionas the -5 "maintain the proper distance between the 5 I carried on under the cre'aser and paster-wheel rotation thereof, thereby impartingto said gear ,80 a speed of rotation less-than that of gear -81. The resultant of these two increased speeds and one decreased speed is an increased speed of gear 80 over that'of driving-gear83, whereby shaft 52 and the mechanism carried thereon are caused to rotate from thepositi on of Fig. 4 to that of Fig. 5 at 'an increasing speed to properly coact with the folding-bed to open out the forward end of the bag-blank on the transverse line of crease 99, Fig. 5 Also roll 17 of foldingbed 11 now passes to a low part-of groove 16 in cam 15, whereby said folding-bed is swung inwardly on pivot 12 of carrier 10. to

folding-bed and shaft52 in the opening out of the bag-' blank, Fig. 5. Arm 79 .still conturning its retractive movement, from the position of Fig. 11 to-that of Fig. 12 and at an increased s ed, as will'be observed from the contour o groove 95 of cam 96, shaft 52 will continue its anticlockwise rotation and at a still increasing speed from the position of Fig. 5 to that of Fig. 6. Thisstill-increasing speed of rotation of shaft 52from the position of Fig. 5 to that of Fig. 6-is re quired to enable the'mechanism of said shaft 52 to properly coact with the folding-bed to complete the diamond fold.

= side clip-rolls 65 75 run off the high parts of From the POSltiQltOfiFig. 12 to that of Fig. 13 arm 79 stands substantially still, as roll94. is then traveling in an approximately con-.

centric portion of groove 95 of cam 96, and shaft 52, therefore, rotates at an approximately uniform speed from the position of Fig.- 6 to that of Fig. 7. At this-later ,position the diamond-folded blank p'asses out of engagement with the mechanism of shaft 52. From the position of Fig. 7 the bag-blank is 190 and thenceto any suitable flap-folding mechanism. (Not shown.) At. the same time arm 79 reverses its direction'of travel;

and from the position of Fig.- 13 to nearly that of Fig. 14 moves slowly outwardly from shaft 30, and thereby slows down the s eed of rotation ofshaft 52' to allow the met: anism carried thereby'to turn over opposite the depressed portion 100 of carrier 10 without interference, Fig. 8. From the position of Fig. 14 arm 79 remainssubstantially-at rest for a shorttime and then. continues .its outward movement, decreasing the speed of ro-.

tation of shaft 52 until that shaft returns to Dlrectly succeeding the positionof 5 its initial position of Fig. 3 to-repeat its operation on another bag-blank.

I claim: I i

1. The combination of a moving foldingbed which is provided with devices to hold the lower ply of a tucked paper tube thereon; a rotary folding mechanism, opposite to the moving folding-bed, and provided with def vices to grip thereto. the upper'ply of the tucked paper tube; and differential mechanism, connected with the rotary folding mechanis m, and adapted to impart thereto aseries'of rotations, each-of which gradually varies in speed during different parts thereof, but is identical ,in aggregate time with one cycle of movementof the mgoying folding bed, orwith' some divisor of that"eycle; all cooperating to unfold a tucked paper tube, and to refold it into a paper-bag blank of a diamond form.

2. The combination of a moving coriveyer an oscillating folding-bed pivoted to the conveyer, and provided with devices to hold the moving conveyer; and provided with devices to grip thereto the'upper plyv of the tucked paper tube and differential mechanism, connected with the rotary folding mechanism, and adapted to impartthereto a series of rotations, each of-which gradually varies in speed duringdifferent parts thereof, but is identical in aggregate time with one cycle of movement of the moving ccnveyer, or with some divisor of that cycle; all cooperating to unfold a tucked ,paper' tube, and to refold it into a aper-bag blank of a diamond form.

3. he combination of a rotary foldingbed, which is provided with devices to hold the lower plyof a tucked paper bag thereon; a rotary folding mechanism opposite to therotary folding-b ed andprovided with devices to grip thereto the upper ply of the tucked paper tube; and differential mechanism, connected with the rotary folding mechanism, and adapted to impart thereto a series of rotations, each of which gradually varies ir speed during different-parts thereof, but is identical in aggregate time with one rotation of the folding-bed, or with some divisor of that rotation; all cooperating to unfold a tucked paper'tube', and to refold it into a paper bag blank of a diamond form.

I 4. The combinationof a rotary conveyer;

an oscillating folding-bedpivoted to the conveyer, and provided with devices to hold the lower ply of a tucked paper tube thereon; a

rotary folding mechanism opposite to th'e.ro

tary conveyor and provided with devices to grip thereto theupper ply of the tucked paper tube; anddifferential niechanismgcoin nected with the rotary folding mechanism,

and adaptedto impart thereto a seriesof rotations,, each of which gradually iva ries in speed during different parts thereof, but is lower ply of a tucked paper tube thereon; a rotary folding mechanism oppositeto the identical in-aggregate time with one rotation 1 of the rotary conveyer, or with some divisor of that rotation; all cooperating to unfold a tucked paper tube, and to refold it into a paper-bag blank of a diamond form.

' 5. The combination of a rotary folding-bed whichis provided with devices tohold the lowerply of the tucked paper tube thereon;

a rotary folding -mechanism opposite to. the

rotary folding-bed and provided with n evices to grip thereto the upper ply of thetncked paper tube; anddifierentialmeohanism connected with the rotary folding mechanism and consisting of two floating gears, and links to retain those gears in mesh, and means to so move those floating gears as to vary the speed of the rotary folding mechanism relatively-to the'tpeed of the rotary folding-bed all cooperating to unfold a tucked paper tube,

and to refold'itinto a paper-bag blank ofa 7 diamond form.

6. The combination oi a rotary co'nveyer; an oscillating folding-bed pivoted to the conveyer and provided with devices to hold the lower ply of a tucked paper tube thereon; a rotary folding mechanism opposite to" the rotary conveyer and provided with devices to grip thereto the-upper ply of the tucked papertube; and differential mechanism, connected with the rotary folding mechanism,

and consisting of two floating gears, and links to retain those gears 1n mesh, and means to so move those floating gears as to vary the speed of the rotary folding mechanism rela- 

